Hey, have you ever gone crazy staring at the snowflakes on the large LED screen? Last week, Lao Zhang's hotpot restaurant opened, and the newly installed large screen suddenly became blurry. He was so anxious that he searched for signal cable connectors all over the place. This may or may not be a big deal, but not understanding the signal lines can really make people bald! Today we broke it apart and crushed it into pieces to talk about it.

1. Where are the signal lines hidden?

​​Let me start with something counter-intuitive.​ ​: The signal line is never on the display! It is like the nerve center of a large screen, usually hidden in three places:

1. ​​Behind the control card​ ​: That iron box the size of a matchbox, 90% of the signal lines are connected here.
2. ​​Splicing cabinet sides​ ​: Especially for large-size splicing screens, each unit box has a dedicated interface
3. ​​In the ground wire trough​ ​: The professional installation team will do hidden work. If you don’t believe me, just lift up the carpet and take a look.

Let’s take a real case: Last year, a large screen in a shopping mall went black. After a long search, the maintenance worker discovered that the sweeper had used the floor trunking as a trash can and had poured coke into the interface. So,​ ​To find the line, first look for the control terminal.​​！

2. How to choose signal lines in different scenarios?

​​Remember this universal formula​ ​: Transmission distance = wire quality × interface type. Let’s divide it into three categories:

Here is a little trivia:​ ​Low brightness and high gray technology​ ​The display screen is more picky about signal lines! Just like a high-end camera must be equipped with a good lens. If you want a high refresh rate of 1920Hz without lagging, the cable transmission rate must be at least 18Gbps.

3. Self-rescue guide for common faults

Last week, I helped a customer fix a weird glitch - the top half of the large screen was normal but the bottom half was blurry. Guess what? The mouse used the signal wire as a teething stick! Don’t panic if this happens, follow these steps:

1. ​​Touch temperature​ ​: A hot interface is probably in poor contact.
2. ​​Look at the indicator light​ ​: If the RX/TX light on the control card does not light up, change the line quickly.
3. ​​Measure voltage​ ​: Use a multimeter to measure the line voltage, the normal value is 3.3V±0.2
4. ​​rocking joint​ ​: Shake the plug gently and the screen will flash indicating that the crystal head needs to be redone.

Let me tell you something from the bottom of my heart:​ ​90% of signal problems are caused by connectors​ ​! The most incredible case I saw last time was that the signal loss rate of the outdoor screen was as high as 37% due to oxidation of the interface. Changing the gold-plated connector immediately solved the problem.

4. Cabling secrets that only experts know

​​Here comes the point​ ​! Three life-saving suggestions for newbies:

1. ​​Don’t save money on wiring​ ​: Spend an extra 200 yuan to buy a cable with a shielding layer, and the signal-to-noise ratio can be increased by 60%
2. ​​Reserve access hatch​ ​: Leave a buckle every 5 meters, so you don’t need to dismantle the ceiling for future maintenance.
3. ​​mark line sequence​ ​: Use different colored tapes to distinguish signal lines, especially for splicing screen systems

Do you remember installing fence screens for a stadium last year? 58 signal lines are mixed together. If they were not marked in advance, debugging would take three days and three nights. So,​ ​Spend half an hour more in the early stage and save a whole day in the later stage​​！

personal opinion

After more than ten years of installation work, I have discovered a strange phenomenon: the more expensive the display, the more likely it is that the signal line will have problems. Later I figured it out——​ ​High-end screens are like sports cars, they must drink 98-octane gasoline​ ​! Those screens that advertise 4K/8K will not be as effective as older phones if they are just fake. So, next time you buy a screen, remember to ask clearly: What are the specifications of the "special ration" for this screen? How long is the warranty for supporting wires? If you ask clearly, you will not be deceived!

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